C# Win App ทำอย่างไรให้ ข้อมูลใน DGV เปลี่ยนแปลง ตามข้อความใน TextBox ครับ

        #region Member

        //Control & Component
        private TextBox txtID;
        private TextBox txtName;
        private Button btnSearch;
        private DataGridView dgv;
        private BindingSource BDS_Master;
        private BindingSource BDS_Detail;

        //Data
        private DataSet DS;

        private DataTable DT1;
        private DataTable DT2;

        private DataColumn DC_Mas_1;
        private DataColumn DC_Mas_2;
        private DataColumn DC_De_1;
        private DataColumn DC_De_2;
        private DataColumn DC_De_3;
        
        
        #endregion

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            DoSetControl();
            DoSetData();

            btnSearch.Click += new EventHandler(button1_Click);

            btnSearch.Focus();
            

        }

        private void DoSetData()
        {
            DS = new DataSet();

            DT1 = new DataTable("Master");
            DT2 = new DataTable("Detail");

            DC_Mas_1 = new DataColumn("MasterID");
            DC_Mas_2 = new DataColumn("MasterName");

            DC_De_1 = new DataColumn("DetailID");
            DC_De_2 = new DataColumn("DetailName");
            DC_De_3 = new DataColumn("ForeignKey");

            DS.Tables.Add(DT1);
            DS.Tables.Add(DT2);

            DT1.Columns.Add(DC_Mas_1);
            DT1.Columns.Add(DC_Mas_2);

            DT2.Columns.Add(DC_De_1);
            DT2.Columns.Add(DC_De_2);
            DT2.Columns.Add(DC_De_3);

            DataRow Dr = DT1.NewRow();

            Dr["MasterID"] = "MID01";
            Dr["MasterName"] = "Master_01";
            DT1.Rows.Add(Dr);

            Dr = DT1.NewRow();
            Dr["MasterID"] = "MID02";
            Dr["MasterName"] = "Master_02";
            DT1.Rows.Add(Dr);

            Dr = DT2.NewRow();
            Dr["DetailID"] = "DID01";
            Dr["DetailName"] = "Detail_01";
            Dr["ForeignKey"] = "MID01";
            DT2.Rows.Add(Dr);

            Dr = DT2.NewRow();
            Dr["DetailID"] = "DID02";
            Dr["DetailName"] = "Detail_02";
            Dr["ForeignKey"] = "MID01";
            DT2.Rows.Add(Dr);

            Dr = DT2.NewRow();
            Dr["DetailID"] = "DID03";
            Dr["DetailName"] = "Detail_03";
            Dr["ForeignKey"] = "MID01";
            DT2.Rows.Add(Dr);

            Dr = DT2.NewRow();
            Dr["DetailID"] = "DID04";
            Dr["DetailName"] = "Detail_04";
            Dr["ForeignKey"] = "MID02";
            DT2.Rows.Add(Dr);

            DataRelation dataRela = new DataRelation("MasterDetail", DC_Mas_1, DC_De_3);
            DS.Relations.Add(dataRela);

            this.BDS_Master.DataSource = DS;
            this.BDS_Master.DataMember = "Master";

            BDS_Detail.DataSource = BDS_Master;
            BDS_Detail.DataMember = "MasterDetail";

            this.txtID.DataBindings.Add("Text", BDS_Master, "MasterID");
            this.txtName.DataBindings.Add("Text", BDS_Master, "MasterName");

            this.dgv.DataSource = BDS_Detail;

           
        }

        private void DoSetControl()
        {

           this.txtID = new System.Windows.Forms.TextBox();
           this.txtName = new System.Windows.Forms.TextBox();
           this.btnSearch = new System.Windows.Forms.Button();
           this.dgv = new System.Windows.Forms.DataGridView();
            this.BDS_Master = new System.Windows.Forms.BindingSource();
            this.BDS_Detail = new System.Windows.Forms.BindingSource();
            // 
            // txtID
            // 
           this.txtID.Location = new System.Drawing.Point(25, 20);
            this.txtID.Name = "txtID";
            this.txtID.Size = new System.Drawing.Size(50, 20);
            this.txtID.TabIndex = 0;
            this.txtID.ReadOnly = false;
            // 
            // txtName
            // 
            this.txtName.Location = new System.Drawing.Point(90, 20);
            this.txtName.Name = "txtName";
            this.txtName.Size = new System.Drawing.Size(75, 20);
            this.txtName.TabIndex = 1;
            this.txtName.ReadOnly = true;
            //
            // btnSearch
            //
            this.btnSearch.Location = new System.Drawing.Point(175, 17);
            this.btnSearch.Name = "btnSearch";
            this.btnSearch.Text = "Search";
            // 
            // dgv
            // 
            this.dgv.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;
            this.dgv.Location = new System.Drawing.Point(25, 60);
            this.dgv.Name = "dgv";
            this.dgv.Size = new System.Drawing.Size(400, 150);
            this.dgv.TabIndex = 2;

            // Size of Form
            this.ClientSize = new System.Drawing.Size(494, 248);

            this.Controls.Add(txtID);
            this.Controls.Add(txtName);
            this.Controls.Add(btnSearch);
            this.Controls.Add(this.dgv);
        }

        private void button1_Click(object sender, EventArgs e)
        {
            int vPosition = BDS_Master.Find("MasterID", txtID.Text.ToString());
            if (vPosition != -1)
            {
                BDS_Master.CancelEdit();
                BDS_Master.Position = vPosition;
            }
        }

   private void mem_id_TextChanged(object sender, EventArgs e)
        {
           แสดงรายการกู้ยืม();
        }